CVE-2006-3918

Status: ModifiedMedium (4.3)—💥 Exploit
http_protocol.c in (1) IBM HTTP Server 6.0 before 6.0.2.13 and 6.1 before 6.1.0.1, and (2) Apache HTTP Server 1.3 before 1.3.35, 2.0 before 2.0.58, and 2.2 before 2.2.2, does not sanitize the Expect header from an HTTP request when it is reflected back in an error message, which might allow cross-site scripting (XSS) style attacks using web client components that can send arbitrary headers in requests, as demonstrated using a Flash SWF file.
CVSS

Version: 2.0
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Base score: 4.3
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 95%
Percentile among all scored CVEs: 100
Score date: 10/7/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.
Published on Exploit-DB · Apache 1.3.35/2.0.58/2.2.2 - Arbitrary HTTP Request Headers Security (8/24/2006)
Affected technologies (5)

Apache — Http Server Canonical — Ubuntu Linux Debian — Debian Linux Redhat — Enterprise Linux Server Redhat — Enterprise Linux Workstation
CWEs

CWE-79
References

Raw JSON (NVD)

Show
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          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
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      "value": "http_protocol.c in (1) IBM HTTP Server 6.0 before 6.0.2.13 and 6.1 before 6.1.0.1, and (2) Apache HTTP Server 1.3 before 1.3.35, 2.0 before 2.0.58, and 2.2 before 2.2.2, does not sanitize the Expect header from an HTTP request when it is reflected back in an error message, which might allow cross-site scripting (XSS) style attacks using web client components that can send arbitrary headers in requests, as demonstrated using a Flash SWF file."
    },
    {
      "lang": "es",
      "value": "http_protocol.c en (1) IBM HTTP Server 6.0 anterioa a 6.0.2.13 y 6.1 anterior 6.1.0.1, y (2) Apache HTTP Server 1.3 anterior a 1.3.35, 2.0 anterior a 2.0.58, y 2.2 anterior a 2.2.2, no desinfecta la cabecera Expect desde una respuesta HTTP cuando se refleja en un mensaje de error, lo cul podría permitir un ataque de tipo secuencia de comandos en sitios cruzados (XSS) utilizando los componentes web del cliente que puede enviar cabeceras de su elección en las respuesta, como se demostró con la utilización de un archivo Flash SWF."
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  "lastModified": "2026-06-16T22:28:04.500",
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  "vendorComments": [
    {
      "comment": "Fixed in Apache HTTP Server 1.3.35:\nhttp://httpd.apache.org/security/vulnerabilities_13.html",
      "lastModified": "2008-07-02T00:00:00",
      "organization": "Apache"
    }
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  "sourceIdentifier": "cve@mitre.org"
}